'93 Voyager coolant recovery system problem

Hi
My '93 Plymouth Voyager 3.0L has a problem. The coolant recovery tank
accepts the hot 'excess' antifreeze when needed, but as the radiator cools,
no antifreeze returns to the radiator. No coolant is really lost, it just
is replaced by air in the radiator neck. The radiator cap is new (the old
one only kept 10 lbs pressure). The recovery tube is not plugged. The
cooling system, when tested, drops pressure from 16 lbs to 12 lbs in a few
minutes. No obvious coolant puddles under the van. Whta do you think is
needing to be fixed?
Thanks,
Walt

 

Try a new rad. cap. Failing that, have the coolling sytem tested for the
prescence of combustion gas. It sounds like you may have a blown head
gasket.
Larry